This article is cited in 6 papers

Brief Communications

High-resolution infrared laser spectroscopy of supercooled hexafluorides of heavy elements

G. S. Baronov, A. D. Britov, S. M. Karavaev, A. I. Karchevskiĭ, S. Yu. Kulikov, A. V. Merzlyakov, S. D. Sivachenko, Yu. I. Shcherbina


Abstract: A tunable injection laser spectrometer was used to investigate the ν₃ band of sulfur, tungsten, and uranium hexafluorides. In order to eliminate hot bands superimposed on the fundamental ν₃ transitions, the gases were supercooled in a supersonic jet. The gas under study constituted 1% of a helium mixture. It was found that in a supersonic jet the rotational temperature of the molecules was reduced to 40 °K. The isotopic structure of the ν₃ band of supercooled WF₆ was resolved and four Q branches corresponding to the ¹⁸⁶W, ¹⁸⁴W, ¹⁸³W, and ¹⁸²W isotopes were observed. The isotope shift was 0.31 cm^–1/amu. For uranium hexafluoride, Q branches of the ν₃ band of uranium isotopes with atomic weights of 238 and 235 were obtained. The isotope shift was 0.650±0.005 cm^–1. The fine structure of the Q branch was resolved, the position of the maximum for U²³⁸F₆ being 627.680 cm^–1.

UDC: 621.373.826

PACS: 33.20.Ea, 07.65.Gj, 42.60.Kg

Received: 19.11.1980

 English version: Soviet Journal of Quantum Electronics, 1981, 11:7, 947–949

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